Saw channelized filters
US4947073A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Feb 4, 1988 |
| Grant date | Aug 7, 1990 |
| Priority date | — |
| Expiry date | Feb 4, 2008 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03H9/72
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
A surface acoustic wave (SAW) device and a related method, for providing improved frequency response characteristics from a SAW spectrum analyzer or channelizer. The device includes a spectrum analyzer with a preprocessing SAW device configured to provide output signals with narrower passbands, lower sidelobe components, or both. The preprocessing SAW device is a tapped delay line in one embodiment, to simulate positional offsets in the placement of input transducers of the analyzer. The tapped delay line can also be used to provide amplitude weighting or can be configured in a chirp spacing, to transform the spectrum analyzer into a chirp analyzer. Another embodiment employs a thinned-electrode prefilter as the preprocessing device, to yield a frequency response with multiple narrow passbands, which are used to narrow the individual channel passbands of the spectrum analyzer or to suppress sidelobes in the frequency response.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.